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Synthesis of polymorpholine‐2,5‐dione‐ block ‐polylactide by two‐step anionic ring‐opening polymerization
Author(s) -
Yongzhen Li,
Jidong He,
Guozhen Cui,
Weina He,
Zheng Peng
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32188
Subject(s) - copolymer , polymer chemistry , polymerization , ring opening polymerization , morpholine , anionic addition polymerization , chemistry , materials science , polymer , organic chemistry
Polymorpholine‐2,5‐dione‐ block ‐polylactide (PMD‐ b ‐PLA) was synthesized via two‐step anionic ring‐opening polymerization at room temperature. First step of ring‐opening polymerization was the ring‐opening of morpholine‐2,5‐dione (MD). It was carried out in an airtight and dry polymerization tube using potassium ethoxide/THF (0.2 M /L) as an initiator for 90 min. Then lactide was ring‐opened in THF solution by the potassium alcoholate of PMD. From the FTIR of the copolymer, we can find all the peaks in PLA and PMD. The 1 H‐NMR of copolymer gave us a proof to the principle of the anionic ring‐opening polymerization and the fraction of PMD in the copolymer was calculated as 86.3%. DSC analysis of copolymer indicated that it was a copolymer with one T g (63.6°C) and two T m s (155.6 and 171.4°C) instead of a mixture of PMD and PLA. The yields of the PMD and the copolymer were 32 and 26%, respectively. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010